Starch: Starch is a carbohydrate which is composed of two polysaccharides called amylose and amylopectine. It is long chains of sugar molecules linked together like a chain. It remains as stored food in the plant body.
Chemical formula: (C6 H10 O5)n
Starch is the key way plant cells amass energy in the form of glucose. This is the core function of starch.